I'm not sure if NCR will list ITE separately, but you will be able to run your car in ITO, which is a new SEDIV class for 2008. As far as why MARRS is not part of the mix this year, that's been discussed at length on other threads.
MARRS is not going to VIR this year, for a variety of reasons (depending on who you ask). Judging by this http://www.ncrscca.com/ncr_road_race_rules.htm it looks like you should be able to compete.